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A326557 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 3
5 12
6 64
7 391
8 2617
9 18738
10 141483
11 1116801
12 9160502
13 77745060
14 680550918
15 6129635386
16 56699324213
17 537823602765
18 5225075478099
19 51939709551433
20 527829047648887
21 5479728265490353
22 58079392804968241
23 628114208288086710
24 6927692801388774583
25 77887967322146451681
26 892270205641708989800
27 10410949755661589229619

[1,1,1,1,3,12,64,391,2617,18738,141483,1116801,
 9160502,77745060,680550918,6129635386,56699324213,
 537823602765,5225075478099,51939709551433,
 527829047648887,5479728265490353,
 58079392804968241,628114208288086710,
 6927692801388774583,77887967322146451681,
 892270205641708989800,10410949755661589229619]

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Last modified July 14 00:54 EDT 2024. Contains 374290 sequences. (Running on oeis4.)